Abstract
Drawbeads are used to control the flow of sheet metal into the die cavity during stretch-draw forming of large panels. They prevent wrinkling in formed panels, reduce the blankholder force, and minimize the blank size needed to make a part. Drawbead restraining forces (pulling forces) and failure locations in the formed sheets are usually evaluated by using drawbead simulation tooling. In this article, a drawbead simulation apparatus is used to assess the influence of variation in material, bead penetration, and fric-tion conditions on the drawbead restraining force. Results from the test can be used as input for sheet metal forming simulation programs.
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References
H.D. Nine, Drawbead Forces in Sheet Metal Forming,Mechanics of Sheet Metal Forming, D. Koistinen and N.M Wang Ed Plenum Press, 1978, p 179
M. Demeri and S. Tang, Post-Processing Analysis in Sheet-Metal Forming Simulation,JOM, Vol 44 (No. 6), June 1992, p 14–16
H.D. Nine, New Drawbead Concepts for Sheet Metal Forming,J. Appl. Metalwork., Vol 2 (No. 3), July 1982, p 185
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Demeri, M.Y. Drawbeads in sheet metal forming. JMEP 2, 863–866 (1993). https://doi.org/10.1007/BF02645686
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DOI: https://doi.org/10.1007/BF02645686